1998 Jeep Laredo whining noise from rear end at 40mph

I am hearing a loud huming and whinning noise when the car accelerates to around 40+ mph. I had the rear bearings replaced but the noise did not stop. Could this need a ring and pinion replacement too? Or could the transmition be involved? What else could cause this problem?
HM

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Monday, May 3rd, 2010 AT 1:05 PM

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BEEF99

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Did you replace the carrier bearings too? Another thing to check is the transfercase, when these whine, a lot of times it will sound like it is coming from the rear or the front. Are you running all 4 tires the same size, if not, this could be your problem too as it will create a binding and wear out your axles, transfer case and other stuff too. LEt us know how you fare and if you need further help.